Hi
monstermonkey,
I bought some VW and Toyota or Nissan single coils off eBay that I think were logic level, I think the smaller was the Toyota/Nissan, but the VW/VAG unit definitely had a built in ignitor and was about £18 inc P&P new!
If you look for Intermotor
12916, you might find it. It is quite bulky, and you'll need a VW Golf/Polo etc plug lead, because it's a different HT connector to the usual car type oil filled coils. I reckon it's about a 65mm cube, but the base has the built in driver, and also a metal heatsink. The 3 pin connector is slightly bigger than the normal Junior Timer one too, but if you google you'll find it.
Not as small as a LS2 but a lot cheaper, and if you are clever, you can mod a pencil coil type to take an HT lead too!
Mike